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Convert fpm to cfm duct size is 20"* 24" and fpm= 1940?

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Convert fpm to cfm duct size is 20"* 24" and fpm= 1940?

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  1. 20 X 24 = 480 SQ.IN. DIVIDE BY 144 TO GET SQ. FT WHICH EQUALS 3.33 SQ. FT.
    FPM X SQ. FT. = CFM. SO, THEN 3.33 X 1940 = 6466.6 CFM

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